From cf2e0082ce88fc2c75479c26a4b9f69f1b028c80 Mon Sep 17 00:00:00 2001 From: Steve Dickson Date: Thu, 29 May 2014 09:40:59 -0400 Subject: [PATCH] Avoid buffer overruns by allocating buffer in svcauth_gss_validate() Reviewed-by: Chuck Lever Signed-off-by: Steve Dickson --- src/svc_auth_gss.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) diff --git a/src/svc_auth_gss.c b/src/svc_auth_gss.c index 601a691..26c1065 100644 --- a/src/svc_auth_gss.c +++ b/src/svc_auth_gss.c @@ -286,21 +286,19 @@ svcauth_gss_validate(struct svc_rpc_gss_data *gd, struct rpc_msg *msg) struct opaque_auth *oa; gss_buffer_desc rpcbuf, checksum; OM_uint32 maj_stat, min_stat, qop_state; - u_char rpchdr[128]; + u_char *rpchdr; int32_t *buf; gss_log_debug("in svcauth_gss_validate()"); - memset(rpchdr, 0, sizeof(rpchdr)); - /* XXX - Reconstruct RPC header for signing (from xdr_callmsg). */ oa = &msg->rm_call.cb_cred; if (oa->oa_length > MAX_AUTH_BYTES) return (FALSE); - - /* 8 XDR units from the IXDR macro calls. */ - if (sizeof(rpchdr) < (8 * BYTES_PER_XDR_UNIT + - RNDUP(oa->oa_length))) + + rpchdr = (u_char *)calloc(((8 * BYTES_PER_XDR_UNIT) + + RNDUP(oa->oa_length)), 1); + if (rpchdr == NULL) return (FALSE); buf = (int32_t *)rpchdr; @@ -325,6 +323,8 @@ svcauth_gss_validate(struct svc_rpc_gss_data *gd, struct rpc_msg *msg) maj_stat = gss_verify_mic(&min_stat, gd->ctx, &rpcbuf, &checksum, &qop_state); + free(rpchdr); + if (maj_stat != GSS_S_COMPLETE) { gss_log_status("gss_verify_mic", maj_stat, min_stat); return (FALSE); -- 2.40.0